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Type of Document	Dissertation
Author	Scheffler, Paul Erick
URN	etd-09222005-113106
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-09222005-113106
Title	Negative pion photoproduction from deuterium and a partial wave analysis of positive pion and negative pion photoproduction in the energy region 500 to 1250 MeV
Degree	PhD
Option	Physics
Advisory Committee	Advisor Name Title Robert Lee Walker Committee Chair
Keywords	none
Date of Defense	1972-01-24
Availability	unrestricted
Abstract NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Single [...] and [...] photoproduction rates from deuterium have been measured at the Caltech 1.5 GeV electron synchrotron at 32 photon energies between 585 and 1250 MeV and for 13 CM pion angles between 6 and 160° at each energy. The cross section for the reaction [...] has been calculated via the [...] ratio from deuterium and via the spectator model for the deuteron. A partial wave analysis has been done on the reactions [...] and [...] in the region of the second and third photoproduction resonances using the model of R. L. Walker. The results show some disagreements with recent quark theories. A case is made for the possibility that the [...] (1535) is excited by isoscalar photons, in agreement with some results of [...] photoproduction experiments, and in disagreement with quark theory. Finally, the helicity 3/2 component of the [...] (1688) resonance in [...] photoproduction is seen to be small, but not zero as predicted by the quark model.
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